I have the Canon 100 L IS macro lens. Canon claim 4 stops IS at none macro distances and two stops at 1:1. Nikon claim no shake reduction at 1:1, the difference being because Canon invented a new form of IS which works for (if my memory serves me correctly) angular movement as well as the normal shake reduction. With the 7D set to Servo and at macro distances the focus sampling and adjustment speed is doubled which takes care of the front to back movement. I shoot most of my macro hand held and I must say it all works extremely well. There are a few examples in my gallery all shot hand held in less than ideal conditions.
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